package com.ming.sparse.array;

public class SparseArray {
    public static void main(String[] args) {
        //创建一个原始的二位数组11*11
        int chessArr1[][] = new int[11][11];
        chessArr1[1][2] = 1;
        chessArr1[2][3] = 2;
        chessArr1[3][4] = 2;
        //遍历原始二位数组
        for (int[] row : chessArr1) {
            for (int data : row) {
                System.out.print(data + "\t");
            }
            System.out.println();
        }

        //将二维数组转 稀疏数组
        int sum = 0;
        for (int i = 0; i < 11; i++) {
            for (int j = 0; j < 11; j++) {
                if (chessArr1[i][j] != 0)
                    sum++;
            }
        }

        int[][] sparseArr = new int[sum + 1][3];
        //给稀疏数组赋值
        sparseArr[0][0] = 11;
        sparseArr[0][1] = 11;
        sparseArr[0][2] = sum;
        int count = 0;//用于记录是第几个非0数据
        for (int i = 0; i < 11; i++) {
            for (int j = 0; j < 11; j++) {
                if (chessArr1[i][j] != 0) {
                    count++;
                    sparseArr[count][0] = i;
                    sparseArr[count][1] = j;
                    sparseArr[count][2] = chessArr1[i][j];
                }
            }
        }
        //输出稀疏数组的形式
        System.out.println();
        for (int[] row : sparseArr) {
            for (int data : row) {
                System.out.print(data + "\t");
            }
            System.out.println();
        }

        //将稀疏数组恢复成二维数组
        int[][] chessArr2 = new int[sparseArr[0][0]][sparseArr[0][1]];

        for (int i = 1; i < sparseArr.length; i++) {
            chessArr2[sparseArr[i][0]][sparseArr[i][1]] = sparseArr[i][2];
        }

        //输出恢复后的二维数组
        System.out.println();
        for (int[] row : chessArr2) {
            for (int data : row) {
                System.out.print(data + "\t");
            }
            System.out.println();
        }
    }
}
